Aqua Claudia
Coordinates: 41°50′46″N 12°33′40″E / 41.846°N 12.561°E
Aqua Claudia (Classical Latin: [ˈakwa ˈklaoodia]) was an ancient Roman aqueduct that, like the Anio Novus, was begun by Emperor Caligula (12–41 AD) in 38 AD and finished by Emperor Claudius (10 BC – 54 AD) in 52 AD.
Together with the Aqua Anio Vetus, Aqua Anio Novus, and Aqua Marcia it is regarded as one of the "four great aqueducts of Rome."
Its main springs, the Caeruleus and Curtius, were situated 300 paces to the left of the 38th milestone of the Via Sublacensis.
The total length was 45–46 miles (c. 69 km) most of which was underground. The flow was about 190000 cubic metres in 24 hours. Directly after its filtering tank, near the seventh mile of the Via Latina, it finally emerged onto arches, which increase in height as the ground falls toward the city, reaching over 100 feet.
It is one of the two ancient aqueducts that flowed through the Porta Maggiore, the other being the Anio Novus. It is described in some detail by Frontinus in his work published in the later 1st century, De aquaeductu.
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